Stellenbosch: RADIUS Systems & DevOps Specialist – Hybrid – Stellenbosch

ENVIRONMENT: Our client provides a pay-as-you-go, uncapped fibre internet solution built specifically for township markets. Customers can access high speed (up to 100 Mbps) fibre from home with no contracts or installation fees, at affordable rates. The mission is simple: make reliable, high-quality internet accessible to everyone. They are seeking a RADIUS Systems & DevOps Specialist to join the Engineering – Platforms team. This role is responsible for the stability, scalability, and security of subscriber authentication and policy enforcement across network platforms. You will own the reliability, performance, and automation of RADIUS and AAA systems, working closely with databases, OSS/BSS platforms, and core network services. The role plays a critical part in ensuring subscriber platforms scale effectively, remain resilient under heavy load, and recover gracefully from failures — supporting a fast-growing user base and a mission-critical service. DUTIES: RADIUS & AAA Platform Management Maintain and operate RADIUS proxies and AAA systems in high-scale ISP environments. Ensure high availability, performance, and security of authentication platforms. Support subscriber authentication, authorization, and policy enforcement services. Systems Integration & Data Management Integrate RADIUS platforms with databases and OSS/BSS systems. Support data flows between authentication systems, network elements, and customer platforms. Assist with troubleshooting complex subscriber and policy-related issues. Scalability, Resilience & Reliability Perform scaling, load, and failure-mode analysis on RADIUS and AAA platforms. Design and implement resilience strategies, redundancy, and failover mechanisms. Participate in incident response, root cause analysis, and long-term remediation. Automation & DevOps Automate deployments, configuration management, and operational tasks. Improve platform consistency, repeatability, and recovery through automation. Support CI/CD practices for platform configuration and updates. REQUIREMENTS: Experience: Hands-on experience operating RADIUS and AAA systems in ISP environments. Strong experience with Linux systems and databases. Experience integrating authentication platforms with OSS/BSS systems. Exposure to AWS and/or on-prem infrastructure environments (advantageous). Technical Competencies: Strong understanding of subscriber authentication and policy enforcement. Experience with scalable, high-availability system design. Solid troubleshooting and performance optimisation skills. Automation mindset with a focus on reliability and repeatability.